[RTTY] PSK31 is faster (Was FD RTTY Question)

[Kok Chen]

On Jun 27, 2012, at 7:22 PM, Jim W7RY wrote:

> And their insistence to only run 50 watts.

That is the correct thing to do, if your rig can only go up to 100 watts.  

Remember that PSK31 has a crest factor of about 3 dB.  By the time your idle Varicode produces 50 watts average RMS output, the peaks of the RF waveform are hitting 100 watts instantaneous power, which is often determined by the PA rail voltage.  Push it any more than that and IMD can climb sky high.

At 50 watts under AWGN conditions, it performs as well as a 100 watt RTTY signal, anyway.  But your power bills drops by 50%.

73
Chen, W7AY